IKEA IVAR shelf safety locking peg (no screws needed)

A safety peg to prevent a shelf from tilting up

When mounting a desk-lamp or monitor arm to an IKEA IVAR shelf, the forces applied can cause a shelf to tilt up causing your goods to slide to the ground.

You can prevent this from happening by mounting at least two, ideally a set of four of these safetly blocks.

To mount them, just slide them in place with the small latch which goes between the vertical stud and the shelf. This prevents the locking block from rotating out under load. To secure it in place, use one of the metal pins that IVAR is known for. Most people do have a few spares. There's no need for tools or screws. Just the stuff IVAR enthusiasts already have at hand.

If you need to mount this in a hard to reach spot, the metal pin clicks into the block, so you cannot drop it.

Main features

• mounts with standard IVAR metal pins

• no crews needed

• very strong due to invisible load-bearing geometry on the inside

• latch prevents the block from rotating out under load

• metal pin clips into the block for easy attachments

Of cource you can choose any colour that matches your interior.

Construction rendering in OpenSCAD. Source code is provided if you want to modify it.

Loaded into Průša Slicer. The chamfered edges ensure a clean print that's easy to remove from the build plate.

Sliced view of the block.

The load-bearing inner geometry is invisible from the outside. It strengthens the part where the most force gets applied. This is part of the geometry itself, not a slicer tweak. You'll get the same strenght whether using the provided .3mf project file, or directly slice the .stl in the slicer software of your preference.

The finished part in black PET-G. I just happen to like black, functional parts.

IVAR board compatibility

Should work with all wooden IVAR shelf boards.

• 83×30 cm, including the folding table, box with separator

• 42×30 cm

• 83×50 cm

• 42×50 cm

• 30c and 50cm corner boards (use 6 safety blocks)

Untested

If you have tested any of these, please tag me in a comment! I'll happily adjust the block for these to be compatible as well. (I just don't have any of these to test by myself.)

• Metal bottle rack

• dark grey felt board

Recommended print settings and requirements

This is an easy print.

• no supports

• no slicer tweaking required

• PET-G is a good choice

• to print a set of four (one for each corner) use the provided .3mf project file

• efficient print, less that 3g per block

• prints in 15 minutes (under an hour for a set of four

Post a Make!

Securing your IVAR shelf with these blocks? What load are you securing with them?

Check out my other models!

Some are weird, but each and every one of them is designed by a human. All parts are tested and print fine.

Version history

• 2026-11-13 Corrected a typo

• 2026-03-16 Added IKEA board compatibility info

• 2026-03-16 initial publishing